Brittany, who has a mass of 75 kg, is riding at 25 m/s in her mini van when she suddenly turns into a parking lot when she see a sale for vintage cook ware. Her seatbelt brings her to a stop in 5 seconds. What is the force exterted on her by her seatbelt?

Photoelectrons with a maximum speed of 6.50 x 107 m/s are ejected from a surface in the presence of light with a frequency of 6.75 x 1014hz. if the mass of an electron is 9.10 x 10-31 kg, calculate in joules the maximum kinetic energy of a single electron. 3.84 x 10-15 j 1.92 x 10-15 j 5.92 x 10-23 j 3.07 x 10-16 j